Hi,
Try MOBAC (+MOBAT2JNX + JNX Customizer) with Virtual-Earth Satellite.bsh add-on to create .jnx satellite imagery, but you'll have to patch your etrex 20.
I compared a few satellite photographs from both Virtual Earth and your dataviewer (from your link above) and they look the same !
You can find Virtual-Earth-Satellite.bsh here :
[Only registered and activated users can see links. ]
This file has to be put into MOBAC mapsources folder.
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